SIST EN ISO 306:2014

SLOVENSKI STANDARD
oSIST prEN ISO 306:2012
01-april-2012
3ROLPHUQLPDWHULDOL3ODVWRPHUL8JRWDYOMDQMHWHPSHUDWXUH]PHKþLãþDSR9LFDWX
967,62',6
Plastics - Thermoplastic materials - Determination of Vicat softening temperature (VST)
(ISO/DIS 306:2012)
Kunststoffe - Thermoplaste - Bestimmung der Vicat-Erweichungstemperatur (VST)
(ISO/DIS 306:2012)
Plastiques - Matières thermoplastiques - Détermination de la température de
ramollissement Vicat (VST) (ISO/DIS 306:2012)
Ta slovenski standard je istoveten z: prEN ISO 306 rev
ICS:
83.080.20 Plastomeri Thermoplastic materials
oSIST prEN ISO 306:2012 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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oSIST prEN ISO 306:2012

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oSIST prEN ISO 306:2012


EUROPEAN STANDARD
DRAFT
prEN ISO 306 rev
NORME EUROPÉENNE

EUROPÄISCHE NORM

January 2012
ICS 83.080.20 Will supersede EN ISO 306:2004
English Version
Plastics - Thermoplastic materials - Determination of Vicat
softening temperature (VST) (ISO/DIS 306:2012)
Plastiques - Matières thermoplastiques - Détermination de Kunststoffe - Thermoplaste - Bestimmung der Vicat-
la température de ramollissement Vicat (VST) (ISO/DIS Erweichungstemperatur (VST) (ISO/DIS 306:2012)
306:2012)
This draft European Standard is submitted to CEN members for parallel enquiry. It has been drawn up by the Technical Committee
CEN/TC 249.

If this draft becomes a European Standard, CEN members are bound to comply with the CEN/CENELEC Internal Regulations which
stipulate the conditions for giving this European Standard the status of a national standard without any alteration.

This draft European Standard was established by CEN in three official versions (English, French, German). A version in any other language
made by translation under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC Management
Centre has the same status as the official versions.

CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,
Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland,
Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and United Kingdom.

Recipients of this draft are invited to submit, with their comments, notification of any relevant patent rights of which they are aware and to
provide supporting documentation.

Warning : This document is not a European Standard. It is distributed for review and comments. It is subject to change without notice and
shall not be referred to as a European Standard.


EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION

EUROPÄISCHES KOMITEE FÜR NORMUNG

Management Centre: Avenue Marnix 17, B-1000 Brussels
© 2012 CEN All rights of exploitation in any form and by any means reserved Ref. No. prEN ISO 306 rev:2012: E
worldwide for CEN national Members.

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oSIST prEN ISO 306:2012
prEN ISO 306:2012 (E)
Contents Page
Foreword .3

2

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oSIST prEN ISO 306:2012
prEN ISO 306:2012 (E)
Foreword
This document (prEN ISO 306:2012) has been prepared by Technical Committee ISO/TC 61 "Plastics" in
collaboration with Technical Committee CEN/TC 249 “Plastics”, the secretariat of which is held by NBN.
This document is currently submitted to the parallel Enquiry.
This document will supersede EN ISO 306:2004.
Endorsement notice
The text of ISO/DIS 306:2012 has been approved by CEN as a prEN ISO 306:2012 without any modification.
3

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oSIST prEN ISO 306:2012

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oSIST prEN ISO 306:2012

DRAFT INTERNATIONAL STANDARD ISO/DIS 306
ISO/TC 61/SC 2 Secretariat: AENOR
Voting begins on Voting terminates on

2012-01-12 2012-06-12
INTERNATIONAL ORGANIZATION FOR STANDARDIZATION    МЕЖДУНАРОДНАЯ ОРГАНИЗАЦИЯ ПО СТАНДАРТИЗАЦИИ    ORGANISATION INTERNATIONALE DE NORMALISATION


Plastics — Thermoplastic materials — Determination of Vicat
softening temperature (VST)
Plastiques — Matières thermoplastiques — Détermination de la température de ramollissement Vicat (VST)
[Revision of fourth edition (ISO 306:2004)]
ICS 83.080.20


ISO/CEN PARALLEL PROCESSING
This draft has been developed within the International Organization for Standardization (ISO), and
processed under the ISO-lead mode of collaboration as defined in the Vienna Agreement.
This draft is hereby submitted to the ISO member bodies and to the CEN member bodies for a parallel
five-month enquiry.
Should this draft be accepted, a final draft, established on the basis of comments received, will be
submitted to a parallel two-month approval vote in ISO and formal vote in CEN.


To expedite distribution, this document is circulated as received from the committee
secretariat. ISO Central Secretariat work of editing and text composition will be undertaken at
publication stage.
Pour accélérer la distribution, le présent document est distribué tel qu'il est parvenu du
secrétariat du comité. Le travail de rédaction et de composition de texte sera effectué au
Secrétariat central de l'ISO au stade de publication.



THIS DOCUMENT IS A DRAFT CIRCULATED FOR COMMENT AND APPROVAL. IT IS THEREFORE SUBJECT TO CHANGE AND MAY NOT BE
REFERRED TO AS AN INTERNATIONAL STANDARD UNTIL PUBLISHED AS SUCH.
IN ADDITION TO THEIR EVALUATION AS BEING ACCEPTABLE FOR INDUSTRIAL, TECHNOLOGICAL, COMMERCIAL AND USER PURPOSES,
DRAFT INTERNATIONAL STANDARDS MAY ON OCCASION HAVE TO BE CONSIDERED IN THE LIGHT OF THEIR POTENTIAL TO BECOME
STANDARDS TO WHICH REFERENCE MAY BE MADE IN NATIONAL REGULATIONS.
RECIPIENTS OF THIS DRAFT ARE INVITED TO SUBMIT, WITH THEIR COMMENTS, NOTIFICATION OF ANY RELEVANT PATENT RIGHTS OF WHICH
THEY ARE AWARE AND TO PROVIDE SUPPORTING DOCUMENTATION.
©  International Organization for Standardization, 2012

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oSIST prEN ISO 306:2012
ISO/DIS 306

Copyright notice
This ISO document is a Draft International Standard and is copyright-protected by ISO. Except as permitted
under the applicable laws of the user’s country, neither this ISO draft nor any extract from it may be
reproduced, stored in a retrieval system or transmitted in any form or by any means, electronic,
photocopying, recording or otherwise, without prior written permission being secured.
Requests for permission to reproduce should be addressed to either ISO at the address below or ISO’s
member body in the country of the requester.
ISO copyright office
Case postale 56  CH-1211 Geneva 20
Tel. + 41 22 749 01 11
Fax + 41 22 749 09 47
E-mail copyright@iso.org
Web www.iso.org
Reproduction may be subject to royalty payments or a licensing agreement.
Violators may be prosecuted.

ii © ISO 2012 – All rights reserved

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oSIST prEN ISO 306:2012
ISO/DIS 306

Contents Page
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Principle . 2
5 Apparatus . 2
6 Test specimens . 6
7 Conditioning . 6
8 Procedure . 6
9 Precision . 7
10 Test report . 7
Annex A (informative) Comparison of VST results obtained with Liquid-filled Heating Bath and
Direct-contact heating unit . 1
Annex B (informative)  Comparison of VST results obtained with Liquid-filled Heating Bath and
Fluidized Bath . 1
Annex C (informative) Repeatability and Precision . 1
C.1 Repeatability . 1
C.2 Precision . 1
C.2.1 Precision data . 1
C.2.2 Precision statement . 3

© ISO 2011 – All rights reserved iii

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ISO/DIS 306

Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies
(ISO member bodies). The work of preparing International Standards is normally carried out through ISO
technical committees. Each member body interested in a subject for which a technical committee has been
established has the right to be represented on that committee. International organizations, governmental and
non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the
International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization.
International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2.
The main task of technical committees is to prepare International Standards. Draft International Standards
adopted by the technical committees are circulated to the member bodies for voting. Publication as an
International Standard requires approval by at least 75 % of the member bodies casting a vote.
Attention is drawn to the possibility that some of the elements of this document may be the subject of patent
rights. ISO shall not be held responsible for identifying any or all such patent rights.
ISO 306 was prepared by Technical Committee ISO/TC 61, Plastics, Subcommittee SC 2, Mechanical
properties.
This second/third/. edition cancels and replaces the first/second/. edition (), [clause(s) / subclause(s) /
table(s) / figure(s) / annex(es)] of which [has / have] been technically revised.
iv © ISO 2011 – All rights reserved

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oSIST prEN ISO 306:2012
ISO/DIS 306

Introduction
The main changes introduced in this revision of ISO 306 can be summarized as follows:
A heating equipment consisting of a fluidized bath is added as a new apparatus, as an alternative to liquid-
filled heating baths and direct-contact heating units. Fluidized baths can reach higher temperatures than
traditional liquid-filled heating baths, so they represent a suitable way to measure VST of thermoplastic
materials having improved thermo-mechanical properties.
Precision data based on a round robin test performed in 2009 are added.
Comparison data for tests with liquid-filled heating bath and fluidized bath are added.
© ISO 2011 – All rights reserved v

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oSIST prEN ISO 306:2012

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oSIST prEN ISO 306:2012

DRAFT INTERNATIONAL STANDARD ISO/DIS 306

Plastics — Thermoplastic materials — Determination of Vicat
softening temperature (VST)
1 Scope
1.1 This International Standard specifies four methods for the determination of the Vicat softening
temperature (VST) of thermoplastic materials:
⎯ Method A50 using a force of 10 N and a heating rate of 50 °C/h
⎯ Method B50 using a force of 50 N and a heating rate of 50 °C/h
⎯ Method A120 using a force of 10 N and a heating rate of 120 °C/h
⎯ Method B120 using a force of 50 N and a heating rate of 120 °C/h
1.2 The methods specified are applicable only to thermoplastics, for which they give a measure of the
temperature at which the thermoplastics start to soften rapidly.
2 Normative references
The following referenced documents are indispensable for the application of this document. For undated
references, the latest edition of the referenced document (including any amendments) applies.
IS0 291 Plastics — Standard atmospheres for conditioning and testing.
IS0 293 Plastics — Compression moulding rest specimens of thermoplastic materials.
IS0 294-1 Plastics — Injection moulding of test specimens of thermoplastic materials — Part 1: General
IS0 294-2 Plastics — Injection moulding of test specimens of thermoplastic materials — Part 2: Small tensile
bars
IS0 294-3 Plastics — Injection moulding of test specimens of thermoplastic materials — Part 3: Small plates
ISO 472 Plastics — Vocabulary
IS0 2818 Plastics — Preparation of test specimens by machining.
IS0 20753 Plastics — Test specimens.
3 Terms and definitions
For the purposes for this document, the terms and definitions given in ISO 472 and the following apply.
© ISO 2011 – All rights reserved 1

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ISO/DIS 306

3.1
Penetration
Distance over which the indenting tip has to penetrate inside the specimen under test
NOTE It is expressed in millimeters (mm).
3.2
Load
Force applied to test specimen by means of the indenting tip
NOTE It is expressed in Newtons (N).
3.3
Vicat softening point (VST)
Temperature at which the indenting tip has reach the defined penetration value as the temperature as
increased
NOTE It is expressed in degrees Celsius (°C).

4 Principle
The temperature at which a standard indenting tip with a flat point penetrates 1 mm into the surface of a
plastic test specimen is determined. The indenting tip exerts a specified force perpendicular to the test
specimen, while the specimen is heated at a specified and uniform rate.
The temperature, in degree Celsius, of the specimen, measured as close as possible to the indented area at 1
mm penetration, is quoted as the VST.
5 Apparatus
5.1 Heating equipment, consisting of one of the following that will accept a minimum of two test frame
assemblies:
5.1.1 Liquid-filled Heating Bath - containing a liquid in which the test specimen can be immersed to a
depth of at least 35 mm. Liquid paraffin, transformer oil, glycerol and silicone oil are suitable liquid heat-
transfer media, but other liquids may be used. An efficient stirrer shall be provided. It shall be established that
the liquid chosen is stable at the temperature used and does not affect the material under test, for example by
swelling or cracking.
NOTE - Do not heat the liquid filled heating bath in excess of the flash point specified by the heat transfer media
manufacturer.
5.1.2 Direct-contact Heating Unit - containing heaters and blocks which, through conductive heating, raise
the temperature of the specimen at a controlled rate until the VST is reached.
5.1.3 Fluidized Bath - containing a fluidized powder bed (e.g. aluminium oxide powder) in which the test
specimen can be immersed to a depth of at least 35 mm. This type of apparatus uses a micrometric
aluminium-oxide powder that, mixed with a suitable flow of heated air, creates a liquid-like heating medium.
The maximum working temperatures (and measurable VSTs) are therefore much higher than those attainable
with liquids as per 5.1.1 an efficient stirring mechanism shall be provided.
5.1.4 The heating equipment shall be provided with temperature control means enabling the temperature to
be raised at a uniform rate of 50 °C/h ± 5 °C/h or 120 °C/h ± 10 °C/h.
The heating rate shall be verified
2 © ISO 2011 – All rights reserved

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ISO/DIS 306

ۛ either by checking and recording the automatically temperature reading;
ۛ or by manually checking and recording the temperature change at 6 minute intervals over the temperature
range being verified .
The requirement for the heating rate shall be considered satisfied if, over every 6 min interval during the test,
the temperature change is 5 °C/h ± 0, 5 °C/h or 12 °C/h ± 1 °C/h, respectively. For multi-position baths, the
heating rate shall be verified at each test station. The apparatus may be designed to shut off the heat
automatically and sound an alarm when the specified indentation has been reached.
5.1.5 Cooling Device – an optional means to reduce the temperature of the heating device may be used to
reduce the time between tests.
5.2 Test frame assemblies, consisting of:
5.2.1 Rod, provided with an add on plate or other suitable load-applying device, held in a rigid metal frame.
The rod shall be able to move freely, with minimum friction, in the vertical direction. The rod shall be designed
to accept weights that will apply the test load. The base of the frame supports the test specimen under the
indenting tip at the end of the rod (see Figure 1 and 2). It is recommended that the rod and the frame(s) be
constructed of low thermal expansion material.
5.2.2 Indenting tip, preferably of hardened steel, 1,5 mm to 3 mm long, of circular cross-section, and of
2 2
area 1,000 mm ± 0,015 mm (corresponding to an indenting-tip diameter of 1,128 mm ± 0,008 mm), fixed at
the bottom of the rod (5.2.1). The surface of the indenting tip in contact with the specimen shall be flat and
perpendicular to the axis of the rod, and free from burrs.
5.2.3 Weights - applied to the rod (5.2.1) centrally so that the total load applied to the test specimen is 10 N
± 0,2 N for methods A50 and A120 and 50 N ± 1 N for methods B50 and B120.
5.2.4 Penetration measuring device - Calibrated micrometer dial gauge, LVDT (linear variable differential
transformer) or other suitable measuring instrument, to measure to ± 0,01 mm the penetration of the indenting
tip into the test specimen.
5.2.5 Temperature measuring device
5.2.5.1 For a Liquid-filled Heating Bath and a Fluidized Bath
Use a mercury-in-glass thermometer of the partial-immersion type, thermocouple or resistance temperature
device (RTD) or another suitable temperature-measuring instrument, of appropriate range and accurate to
within 0,5 °C. Mercury-in-glass thermometers shall be calibrated at the depth of immersion required by 8.2.
The temperature measuring device
...